My MacBook Pro was lost/stolen during security check at an airport most likely ORD.

Follow these instructions: If your Mac is lost or stolen - Apple Support

If you are getting "death threats", notify your local police.

munawarfromfairport Said:

"My MacBook Pro was lost/stolen during security check at an airport most likely ORD.: I tried the TSA, also a private retrieval service but all to no avail. The stolen Mac is with someone who is trying to infiltrate into my current Mac. Having failed to break into my Mac I am getting death threats. Since the Mac has a GPS locator is it possible to find its location?"

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Troubleshooting a Stollen Device:

I. Secure your Account:

Having been stollen, someone likley has your info. So, do three Things:

A. Verify Your Devices:

Verify that your the devices logged in to your account or officially yours, by using this link: Check your Apple ID Device List to See where you're Signed in - Apple Support

B. Consider Modifying your Credentials:

By all means, consider modifying your credentials, starting with a new password.

• Modify: your login credentials (Using Both a New eMail and a New Password for each and all sites)
• Associate: a different method of payment to your account
• Enable: Two-Factor Authentication for Apple ID and for all other accounts that have such an applicable option.

C. Change the Password and Passcode:

• Mac: Change or Reset the Password of a macOS User Account in macOS Mojave or Earlier - Apple Support
• iPhone: Change your Passcode or Passcode Settings - Apple Support

II. As for death threats...

Report this: Take Screenshots of these messages. And report things... Use my User Tip: Using the Photos App to Report Scams: - User Tips

Since the Mac has a GPS locator ...

They don't.

The good news, such as it is, is that a Mac is utterly useless to anyone without your password.

Follow the others' instructions.